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Follow up to r1738466: During graceful shutdown, when the listener thread is
closing a connection, it needs to wake up a worker thread so that it may
terminate.



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During graceful shutdown, if there are more running worker threads than open
connections, terminate some threads. This frees resources faster, which may be
needed for new processes.



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When shutting down a process gracefully, terminate keep-alive connections so
that we don't get any new requests which may keep the dying process alive
longer.



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- DH was made opaque


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  in preference to named segment.  Ensure startup is possible after an
  unclean shutdown.


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A recent email in docs@ brought up an interesting use case, namely mixing 
mod_access_compact (Order, Deny, Allow) and mod_authz_host (Require) directives
while migrating from 2.2 to 2.4. This is technically possible but it leads
to a lot of confusion due to how config merge works between these modules. This change adds
some examples on the documentation about things that might go wrong when mixing
old and new directives, stating clearly that mod_access_compact or mod_authz_host
should not be used together.



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Add the missing -ne in RewriteCond

Add some missing hyperlinks to the corresponding directives.

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Add the missing -ne in RewriteCond

Add some missing hyperlinks to the corresponding directives.

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- BIO was made opaque after OpenSSL 1.1.0pre4.


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Idea from Rob.

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Same spurious (duplicated) local variable removal, this time for mpm_worker.

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Remove one spurious (duplicated) local variable and split some long lines.



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according the number of listeners buckets.

We want the number of children processes to be a multiple of the number of
buckets so to optimally accept connections (the system will distribute them
accross all the buckets/listeners anyway, thus children must follow).

For MinSpareThreads, this means that we need neither more nor less than one
thread above 'threads_per_child * (num_buckets - 1)' to achieve this, since
each created child adds threads_per_child workers.

Actually, given that perform_idle_server_maintenance() is called per bucket,
and hence checks 'threads_per_child / num_buckets' for one bucket, let's lower
bound MinSpareThreads to 'threads_per_child * (num_buckets - 1) + num_buckets'.

Previously we used 'threads_per_child * num_buckets' which caused one spurious
child to be created from the very first busy worker thread of each newly added
child.



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Add a few more links to modules and directives (more could be done)

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